Can my husband adopt the older two children?

I doubt it it doesn't sound like the time between payments and participation in their lives is sufficient to terminate his rights

What are the advantages/disadvantages Commitment, Owners Policy & Lenders Policy. is it Must to have it ? if yes which ones?

As you can imagine because the purchase of the home is one of the most expensive purchases you make in your life any title insurance is a must

Wanting to relocate to another state

Missouri has a relocation statute I would encourage you to read it fully or hire legal counsel before you move

Somewhat difficult to answer this question without reading the incident report and negotiating with the various parties.

So, can I tell the estate attorney to back off & I will handle it without their help, this portfolio has NOTHING to do with them

In Missouri estate administration requires an attorney. That professional normally adheres to the request of his client. Sit and discuss your...

Can I win in court, without a contract being notarized, but signed by the debtor and I?

A contract may be oral. Witnesses and verified signatures aren't always necessary.

30 day Notice to Vacate for repairs

It's impossible to answer this question without reviewing the lease.

What is the least expensive way to distribute money? What are the other concerns?

Many ways to address this but don't sell the home unless you absolutely need the money now. A beneficiary deed would allow a non probate transfer.

Would I have a valid case to sue them in court?

Of course. Breach of contract is your primary complaint.

Can my ex do this if he has never legally adopted my son, and we never married?

No. Hire an attorney to file an unlawful detainer action to remove him from your premises.